IF HDL and LDL are not cholesterol, then why are they referred to as such:

"Your cholesterol levels show how much cholesterol is circulating in your blood. Your HDL (“good” cholesterol) is the one number you want to be high (ideally above 60). Your LDL (“bad” cholesterol) should be below 100. Your total should be below 200. Talk with your provider about what your results mean for you and how to manage your cholesterol."